星载分布式SAR双频乒乓模式测高精度分析  

Analysis of interferometric mapping accuracy for spaceborne distributed SAR dual-frequency alternative bistatic mode

作　　者：王媛 徐华平[1] 李春升[1] 曾国兵 刘爱芳[2] 葛仕奇 WANG Yuan;XU Huaping;LI Chunsheng;ZENG Guobing;LIU Aifang;GE Shiqi(School of Electronic and Information Engineering,Beihang University,Beijing 100191,China;Nanjing Research Institute of Electronics Technology,Nanjing 211113,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191 [2]南京电子技术研究所,江苏南京211113

出　　处：《测绘学报》2024年第3期463-472,共10页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(U2241202)。

摘　　要：星载分布式合成孔径雷达(SAR)系统用于干涉测绘,凭借其基线灵活、时间去相关很小的特点得到了快速发展。与传统模式相比,双频乒乓模式能够同时得到两种频率的多幅SAR图像,可以实现更高精度的高程测量。本文首先简单介绍了双频乒乓模式的工作原理,然后深入研究了该模式下SAR干涉对的相位比例关系和相关性,理论上分析了其干涉相位估计精度和对应的测高精度,从而为系统设计和干涉处理方法研究提供理论依据。最后仿真分析结果直观展示了双频乒乓模式相较于传统模式的优越性,由于该模式增加了不同频率的干涉相位数据,干涉相位估计精度和测高精度均显著提升。Due to flexible baseline and minimal temporal decorrelation,spaceborne distributed synthetic aperture radar(SAR)systems have been rapidly developed and widely applied in interferometric mapping.Dual-frequency alternative bistatic mode is an emerging mode,it can simultaneously acquire multiple SAR images at two frequencies compared with the conventional mode,which enables higher accuracy of interferometric mapping.In this paper,the fundamental of dual-frequency alternative bistatic mode is briefly introduced.Then,the phase ratio relationship and coherence characteristics of SAR interferometric pairs in this mode are investigated in depth,and the interferometric phase accuracy and mapping accuracy are analyzed theoretically,which provides a theoretical basis for the design of the SAR systems and the study of the interferometric processing.Finally,simulation results demonstrate the superiority of the dual-frequency alternative bistatic mode over the conventional mode.This mode can increase the interferometric phase data of different frequencies,thereby improving the accuracy of interferometric mapping.

关 键 词：星载分布式合成孔径雷达 INSAR 双频乒乓模式 测高精度分析 

分 类 号：P237[天文地球—摄影测量与遥感]